This change may make “medium security” SSL connections show errors for some very old browsers running on Windows XP. (Most such browsers already failed anyway with “medium security”, and they can’t connect to most major sites on the Internet, so almost nobody uses them.) In the unlikely event that you do need a very old browser like that to connect to an SSL-enabled site, you can choose Low security, excellent compatibility: Enable SSLv3 and TLS 1.0 in our control panel to allow it.